Telephone cable



E. FISCHER TELEPHONE CABLE Filed Oct. 19, 1929 A ril 12, 1932.

Patented Apr. 12, 1932 UNITED STATES PATENT OFFICE ERNST FISCHER, OFBERLIN-TEMPELHOF, GERMANY, ASSIGNOR TO SIEMENS- SCHUCKERTWERKEAKTIENGESELLSCHAFT, OF BERLIN-SIEMENSS TADT, GERMANY,

A. CORPORATION OF GERMANY TELEPHONE CABLE Application filed October 19,1929, Serial No. 400,971, and in Germany October 20, 1928.

connected with the. main conductors and.

function as condensers.

A particular novel manner of arranging such condenser conductors inconnection with the cable conductors is disclosed and claimed in mycopending application Serial No. 381,-

779, filed July 29, 1929, on which arrangement the present invention isa further improvement.

I have now ascertained that a particularly good effect is obtained ifthese additional or auxiliary conductors are given a cross-section ofother than circular shape and if they are so arranged in relation to oneanother that their mutual capacity becomes as high as possible. Theconductors may, for instance, be made of tape or strip copper and beplaced together with their broad sides with an insulation between them.They may also be constructed of tapes folded or tucked together.

Some embodiments of my invention are illustrated in the drawings affixedto my specification. In these drawings Fig. 1 shows my improvedtelephone cable in longitudinal section,

Fig. 2. this cable in cross-section, and

Figs. 3, 4 and 5 equalizing condensers designed as conductors of across-section other than of circular shape.

Referring to Fig. 1 of the drawings 1 are the main double conductors ofa telephone cable and 2 the equalizing or balancing condensers designedas additional conductors of a cross-section other than circular. 3 isthe lead sheath of the cable.

In Fig. 2, 1 are again the double conductors of the telephone cable, 2the additional conductors of a cross-section other than circular andserving as equalizing condensers, and 3 denotes the lead sheath of thecable. This figure clearly shows the location of the condenser conductorpairs with relation to the main conductor pairs.

In Fig. 3, 11, 12 are the condenser conductors, 13, 14 representsrespectively their insulation, and 15 denotes the common wrapping.

An example of higher capacitance is illustrated in Fig. 4. of thedrawings. 26, 27 are here the tape or strip conductors, 28, 29 theinsulating layers of the same.

Fig. 5 shows a modification in which tapes or strips are folded ortucked into one another. 30, 31 are the folded conductors and 32represents the insulation of these conductors.

I claim as my invention:

1. A telephone cable having insulated conductors, equalizing condensersand a lead sheath surrounding the aforesaid elements, said equalizingcondensers consisting of additional conductors embedded in said cableand having a cross-section of other than circular shape, at least someof said equalizing condensers being electrically connected with saidinsulated cable conductors.

2. A telephone cable having insulated conductors, equalizing condensersand a lead sheath surrounding the aforesaid elements, said equalizingcondensers consisting of ad'- ditional conductors embedded in said cableand having a cross-section of other than circularshape and being soarranged in relation to each other that their mutual capacitance issufficiently high, at least some of said equalizing condensers beingelectrically connected with said insulated cable conductors.

3. A telephone cable having insulated conductors, equalizing condensersand a lead sheath surrounding the aforesaid elements, said equalizingcondensers consisting of additional conductors embedded in said cableand having the shape of a tape, folded longitudinally to assume aU-shaped cross-section any two of said conductors bein inserted intoeach other to form an equalizing condenser.

I 4:. A telephone cable having insulated conductors, equalizingcondensers and a lead sheath surrounding the aforesaid elements, saidequalizing condensers consisting of additional conductors embedded insaid cable 10 and having the shape of a tape, folded longitudinally toassume a U-shaped cross-section, any two of said conductors beinginserted into each other to form an equalizing condenser, at least someof said condensers being electri- 15 cally connected with said insulatedcable conductors.

In testimony whereof I alfix my signature.

ERNST FISCHER.

